2332 Mask ROM 4K×8 pinout
DIP-24. Character ROM (C64, VIC-20, PET)
4K x 8 mask ROM holding the character shapes, with two mask-programmed chip selects (pins 20, 21). A bad character ROM gives missing or garbled letters. Replace with a 2732 EPROM via an adapter (pin 21 differs).
Open the interactive 2332 pinoutPins
| Pin | Name | Type | Signal |
|---|---|---|---|
| 1 | A7 | addr | Address bit 7. |
| 2 | A6 | addr | Address bit 6. |
| 3 | A5 | addr | Address bit 5. |
| 4 | A4 | addr | Address bit 4. |
| 5 | A3 | addr | Address bit 3. |
| 6 | A2 | addr | Address bit 2. |
| 7 | A1 | addr | Address bit 1. |
| 8 | A0 | addr | Address bit 0. |
| 9 | D0 | data | Data out bit 0 (data sheet O1). |
| 10 | D1 | data | Data out bit 1 (O2). |
| 11 | D2 | data | Data out bit 2 (O3). |
| 12 | GND | ground | 0 V. |
| 13 | D3 | data | Data out bit 3 (O4). |
| 14 | D4 | data | Data out bit 4 (O5). |
| 15 | D5 | data | Data out bit 5 (O6). |
| 16 | D6 | data | Data out bit 6 (O7). |
| 17 | D7 | data | Data out bit 7 (O8). |
| 18 | A11 | addr | Address bit 11. |
| 19 | A10 | addr | Address bit 10. |
| 20 | CS1 | ctrl | Chip select 1. Polarity is mask-programmed (CS1 or /CS1). |
| 21 | CS2 | ctrl | Chip select 2. Polarity is mask-programmed (CS2 or /CS2). |
| 22 | A9 | addr | Address bit 9. |
| 23 | A8 | addr | Address bit 8. |
| 24 | VCC | power | +5 V supply. |
Fitted in
- Commodore 64 U5 (character 901225)
- VIC-20 UD7 (character 901460-03)
- PET / CBM
- TRS-80 Model III U105 (ROM B)
- TRS-80 Model 4 U69 (MCM68A332)